It often signifies a transition from heavily compressed formats to pristine Blu-Ray rips (such as 1080p BDRip or 4K UHD) paired with high-fidelity audio codecs like Dolby Digital (AC3) or DTS.
For international cinema lovers in India and South Asia, dual audio files are incredibly popular. A "Dual Audio" encode contains two or more audio tracks multiplexed into a single video file (usually in MKV or MP4 format). Benefits of Dual Audio Files spectral 2016 dual audio hindi upd